Yettiesoft VestCert Remote Code Execution Vulnerability
In Yettiesoft VestCert versions 2.36 to 2.5.29, a vulnerability exists due to improper validation of third-party modules. This allows malicious actors to load arbitrary third-party modules, leading to remote code execution.
- Published
- Oct 30, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 48th percentile
- CWE
- CWE-829
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Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CNA vs NVD score
- NVD
- 9.8
- CNA · krcert
- 8.4
- 1.4 point gap
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| yettiesoft | vestcert | cpe:2.3:a:yettiesoft:vestcert |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- yettiesoft vestcert2.3.6 and later · before 2.5.30
Versions reported by the vendor
Affected version ranges reported by the assigning authority (krcert). Independent of NVD's CPE analysis and usually ahead of it.
Yettiesoft VestCert
- 2.3.6 and later · up to and including 2.5.29affectedfixed in 2.5.30
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Yettiesoft VestCert | 2.5.30 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Kim Joon-Seokreporter
- Song Tae-Hyunreporter
- Han Myung-Wookreporter
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-829 · Inclusion of Functionality from Untrusted Control SphereCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Code InclusionCAPEC-175likelihood: Medium · Very High
- Serialized Data External LinkingCAPEC-201likelihood: High · High
- DTD InjectionCAPEC-228Medium
- Local Code InclusionCAPEC-251Medium
- PHP Local File InclusionCAPEC-252Medium
- Remote Code InclusionCAPEC-253
- Force Use of Corrupted FilesCAPEC-263Medium
- Open-Source Library ManipulationCAPEC-538likelihood: Low · High
ATT&CK techniques
- Process InjectionT1055
- Browser ExtensionsT1176
- Supply Chain Compromise: Software Dependencies and Development ToolsT1195.001
- Server Software Component: IIS ComponentsT1505.004
- Server Software Component: Terminal Services DLLT1505.005
- Hijack Execution Flow: Dynamic Linker HijackingT1574.006
- Hijack Execution Flow: KernelCallbackTableT1574.013
- Reflective Code LoadingT1620
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.